git.sur5r.net Git - u-boot/blob - arch/x86/lib/zimage.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2002
   4  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 /*
  10  * Linux x86 zImage and bzImage loading
  11  *
  12  * based on the procdure described in
  13  * linux/Documentation/i386/boot.txt
  14  */
  15
  16 #include <common.h>
  17 #include <asm/io.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/zimage.h>
  20 #include <asm/byteorder.h>
  21 #include <asm/bootm.h>
  22 #include <asm/bootparam.h>
  23 #ifdef CONFIG_SYS_COREBOOT
  24 #include <asm/arch/timestamp.h>
  25 #endif
  26 #include <linux/compiler.h>
  27 #include "acpi_table.h"
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 /*
  32  * Memory lay-out:
  33  *
  34  * relative to setup_base (which is 0x90000 currently)
  35  *
  36  *      0x0000-0x7FFF   Real mode kernel
  37  *      0x8000-0x8FFF   Stack and heap
  38  *      0x9000-0x90FF   Kernel command line
  39  */
  40 #define DEFAULT_SETUP_BASE      0x90000
  41 #define COMMAND_LINE_OFFSET     0x9000
  42 #define HEAP_END_OFFSET         0x8e00
  43
  44 #define COMMAND_LINE_SIZE       2048
  45
  46 static void build_command_line(char *command_line, int auto_boot)
  47 {
  48         char *env_command_line;
  49
  50         command_line[0] = '\0';
  51
  52         env_command_line =  env_get("bootargs");
  53
  54         /* set console= argument if we use a serial console */
  55         if (!strstr(env_command_line, "console=")) {
  56                 if (!strcmp(env_get("stdout"), "serial")) {
  57
  58                         /* We seem to use serial console */
  59                         sprintf(command_line, "console=ttyS0,%s ",
  60                                 env_get("baudrate"));
  61                 }
  62         }
  63
  64         if (auto_boot)
  65                 strcat(command_line, "auto ");
  66
  67         if (env_command_line)
  68                 strcat(command_line, env_command_line);
  69
  70         printf("Kernel command line: \"%s\"\n", command_line);
  71 }
  72
  73 static int kernel_magic_ok(struct setup_header *hdr)
  74 {
  75         if (KERNEL_MAGIC != hdr->boot_flag) {
  76                 printf("Error: Invalid Boot Flag "
  77                         "(found 0x%04x, expected 0x%04x)\n",
  78                         hdr->boot_flag, KERNEL_MAGIC);
  79                 return 0;
  80         } else {
  81                 printf("Valid Boot Flag\n");
  82                 return 1;
  83         }
  84 }
  85
  86 static int get_boot_protocol(struct setup_header *hdr)
  87 {
  88         if (hdr->header == KERNEL_V2_MAGIC) {
  89                 printf("Magic signature found\n");
  90                 return hdr->version;
  91         } else {
  92                 /* Very old kernel */
  93                 printf("Magic signature not found\n");
  94                 return 0x0100;
  95         }
  96 }
  97
  98 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
  99                                 ulong *load_addressp)
 100 {
 101         struct boot_params *setup_base;
 102         int setup_size;
 103         int bootproto;
 104         int big_image;
 105
 106         struct boot_params *params = (struct boot_params *)image;
 107         struct setup_header *hdr = &params->hdr;
 108
 109         /* base address for real-mode segment */
 110         setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
 111
 112         if (!kernel_magic_ok(hdr))
 113                 return 0;
 114
 115         /* determine size of setup */
 116         if (0 == hdr->setup_sects) {
 117                 printf("Setup Sectors = 0 (defaulting to 4)\n");
 118                 setup_size = 5 * 512;
 119         } else {
 120                 setup_size = (hdr->setup_sects + 1) * 512;
 121         }
 122
 123         printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
 124
 125         if (setup_size > SETUP_MAX_SIZE)
 126                 printf("Error: Setup is too large (%d bytes)\n", setup_size);
 127
 128         /* determine boot protocol version */
 129         bootproto = get_boot_protocol(hdr);
 130
 131         printf("Using boot protocol version %x.%02x\n",
 132                (bootproto & 0xff00) >> 8, bootproto & 0xff);
 133
 134         if (bootproto >= 0x0200) {
 135                 if (hdr->setup_sects >= 15) {
 136                         printf("Linux kernel version %s\n",
 137                                 (char *)params +
 138                                 hdr->kernel_version + 0x200);
 139                 } else {
 140                         printf("Setup Sectors < 15 - "
 141                                 "Cannot print kernel version.\n");
 142                 }
 143         }
 144
 145         /* Determine image type */
 146         big_image = (bootproto >= 0x0200) &&
 147                     (hdr->loadflags & BIG_KERNEL_FLAG);
 148
 149         /* Determine load address */
 150         if (big_image)
 151                 *load_addressp = BZIMAGE_LOAD_ADDR;
 152         else
 153                 *load_addressp = ZIMAGE_LOAD_ADDR;
 154
 155         printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
 156         memset(setup_base, 0, sizeof(*setup_base));
 157         setup_base->hdr = params->hdr;
 158
 159         if (bootproto >= 0x0204)
 160                 kernel_size = hdr->syssize * 16;
 161         else
 162                 kernel_size -= setup_size;
 163
 164         if (bootproto == 0x0100) {
 165                 /*
 166                  * A very old kernel MUST have its real-mode code
 167                  * loaded at 0x90000
 168                  */
 169                 if ((ulong)setup_base != 0x90000) {
 170                         /* Copy the real-mode kernel */
 171                         memmove((void *)0x90000, setup_base, setup_size);
 172
 173                         /* Copy the command line */
 174                         memmove((void *)0x99000,
 175                                 (u8 *)setup_base + COMMAND_LINE_OFFSET,
 176                                 COMMAND_LINE_SIZE);
 177
 178                          /* Relocated */
 179                         setup_base = (struct boot_params *)0x90000;
 180                 }
 181
 182                 /* It is recommended to clear memory up to the 32K mark */
 183                 memset((u8 *)0x90000 + setup_size, 0,
 184                        SETUP_MAX_SIZE - setup_size);
 185         }
 186
 187         if (big_image) {
 188                 if (kernel_size > BZIMAGE_MAX_SIZE) {
 189                         printf("Error: bzImage kernel too big! "
 190                                 "(size: %ld, max: %d)\n",
 191                                 kernel_size, BZIMAGE_MAX_SIZE);
 192                         return 0;
 193                 }
 194         } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
 195                 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
 196                        kernel_size, ZIMAGE_MAX_SIZE);
 197                 return 0;
 198         }
 199
 200         printf("Loading %s at address %lx (%ld bytes)\n",
 201                big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
 202
 203         memmove((void *)*load_addressp, image + setup_size, kernel_size);
 204
 205         return setup_base;
 206 }
 207
 208 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
 209                  unsigned long initrd_addr, unsigned long initrd_size)
 210 {
 211         struct setup_header *hdr = &setup_base->hdr;
 212         int bootproto = get_boot_protocol(hdr);
 213
 214         setup_base->e820_entries = install_e820_map(
 215                 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
 216
 217         if (bootproto == 0x0100) {
 218                 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 219                 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
 220         }
 221         if (bootproto >= 0x0200) {
 222                 hdr->type_of_loader = 8;
 223
 224                 if (initrd_addr) {
 225                         printf("Initial RAM disk at linear address "
 226                                "0x%08lx, size %ld bytes\n",
 227                                initrd_addr, initrd_size);
 228
 229                         hdr->ramdisk_image = initrd_addr;
 230                         hdr->ramdisk_size = initrd_size;
 231                 }
 232         }
 233
 234         if (bootproto >= 0x0201) {
 235                 hdr->heap_end_ptr = HEAP_END_OFFSET;
 236                 hdr->loadflags |= HEAP_FLAG;
 237         }
 238
 239         if (cmd_line) {
 240                 if (bootproto >= 0x0202) {
 241                         hdr->cmd_line_ptr = (uintptr_t)cmd_line;
 242                 } else if (bootproto >= 0x0200) {
 243                         setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 244                         setup_base->screen_info.cl_offset =
 245                                 (uintptr_t)cmd_line - (uintptr_t)setup_base;
 246
 247                         hdr->setup_move_size = 0x9100;
 248                 }
 249
 250                 /* build command line at COMMAND_LINE_OFFSET */
 251                 build_command_line(cmd_line, auto_boot);
 252         }
 253
 254 #ifdef CONFIG_INTEL_MID
 255         if (bootproto >= 0x0207)
 256                 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
 257 #endif
 258
 259 #ifdef CONFIG_GENERATE_ACPI_TABLE
 260         if (bootproto >= 0x020e)
 261                 hdr->acpi_rsdp_addr = acpi_rsdp_addr;
 262 #endif
 263
 264         setup_video(&setup_base->screen_info);
 265
 266         return 0;
 267 }
 268
 269 void setup_pcat_compatibility(void)
 270         __attribute__((weak, alias("__setup_pcat_compatibility")));
 271
 272 void __setup_pcat_compatibility(void)
 273 {
 274 }
 275
 276 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 277 {
 278         struct boot_params *base_ptr;
 279         void *bzImage_addr = NULL;
 280         ulong load_address;
 281         char *s;
 282         ulong bzImage_size = 0;
 283         ulong initrd_addr = 0;
 284         ulong initrd_size = 0;
 285
 286         disable_interrupts();
 287
 288         /* Setup board for maximum PC/AT Compatibility */
 289         setup_pcat_compatibility();
 290
 291         if (argc >= 2) {
 292                 /* argv[1] holds the address of the bzImage */
 293                 s = argv[1];
 294         } else {
 295                 s = env_get("fileaddr");
 296         }
 297
 298         if (s)
 299                 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
 300
 301         if (argc >= 3) {
 302                 /* argv[2] holds the size of the bzImage */
 303                 bzImage_size = simple_strtoul(argv[2], NULL, 16);
 304         }
 305
 306         if (argc >= 4)
 307                 initrd_addr = simple_strtoul(argv[3], NULL, 16);
 308         if (argc >= 5)
 309                 initrd_size = simple_strtoul(argv[4], NULL, 16);
 310
 311         /* Lets look for */
 312         base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
 313
 314         if (!base_ptr) {
 315                 puts("## Kernel loading failed ...\n");
 316                 return -1;
 317         }
 318         if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
 319                         0, initrd_addr, initrd_size)) {
 320                 puts("Setting up boot parameters failed ...\n");
 321                 return -1;
 322         }
 323
 324         /* we assume that the kernel is in place */
 325         return boot_linux_kernel((ulong)base_ptr, load_address, false);
 326 }
 327
 328 U_BOOT_CMD(
 329         zboot, 5, 0,    do_zboot,
 330         "Boot bzImage",
 331         "[addr] [size] [initrd addr] [initrd size]\n"
 332         "      addr -        The optional starting address of the bzimage.\n"
 333         "                    If not set it defaults to the environment\n"
 334         "                    variable \"fileaddr\".\n"
 335         "      size -        The optional size of the bzimage. Defaults to\n"
 336         "                    zero.\n"
 337         "      initrd addr - The address of the initrd image to use, if any.\n"
 338         "      initrd size - The size of the initrd image to use, if any.\n"
 339 );